Design History File (DHF). Humanoid Hand¶

1. Introduction¶

  • Background and motivation for the prosthetic hand design.
  • Target user group and their specific needs.
  • Overview of the design goals and objectives.

2. User Needs Analysis¶

  • User demographics (age, occupation, lifestyle).
  • Functional requirements based on daily activities.
  • Cognitive and ergonomic considerations.
  • Input from potential users and clinicians.

3. Literature Review¶

  • Review of existing prosthetic hand designs.
  • Overview of materials and technologies used.
  • Analysis of success stories and challenges in prosthetic design.

4. Regulatory and Ethical Considerations¶

  • Compliance with relevant medical device regulations.
  • Ethical considerations in prosthetic design.
  • Patient safety and risk management.

5. Biomechanics and Ergonomics¶

  • Study of human hand anatomy and biomechanics.
  • Ergonomic considerations for comfortable use.
  • Range of motion and dexterity requirements.

6. Materials Selection¶

  • Overview of materials suitable for prosthetic design.
  • Consideration of factors such as weight, strength, and biocompatibility.
  • Integration of advanced materials (if applicable).

7. Mechanical Design¶

  • Joint design and actuation mechanisms.
  • Power source selection (e.g., myoelectric, pneumatic, or mechanical).
  • Integration of sensors for feedback.

8. Control System¶

  • Control interface (myoelectric signals, sensors, etc.).
  • Signal processing and decoding algorithms.
  • Human-machine interface considerations.

9. Prototyping and Testing¶

  • Rapid prototyping of the prosthetic hand.
  • Mechanical testing for strength and durability.
  • Functional testing with potential users.

10. Human Factors and Usability Testing¶

  • User-centered design considerations.
  • Usability testing with target users.
  • Iterative design based on user feedback.

11. Integration of Artificial Intelligence (AI)¶

  • Explore AI applications for adaptive control.
  • Machine learning for personalized adjustments.
  • Considerations for AI-powered enhancements.

12. Cost Analysis and Manufacturing¶

  • Estimate manufacturing costs.
  • Considerations for mass production.
  • Selection of manufacturing methods and vendors.

13. Documentation and Design History File (DHF)¶

  • Comprehensive documentation of the design process.
  • Design validation and verification.
  • DHF for regulatory compliance.

14. Future Enhancements and Scalability¶

  • Considerations for future upgrades.
  • Scalability for different user needs.
  • Potential collaboration with the research community.

15. Conclusion¶

  • Summary of key design achievements.
  • Reflection on challenges and lessons learned.
  • Considerations for future improvements and research.

Design Source Control¶

Version 1 to v6¶

Parametrization¶

  • High level:
    • Ideally, I would like to parametrize the hand using the 95-percentile for humans (human_hand_95percentile) using the age as the input.
    • So, you input the age of the victim and the hand readjust to what the 95-percentile for an indivudual of that age is.
  • Low level:
    • Let's start w/ basic parametrization and relation to allow the finger to not break when changing parameters.
    • Key parameters occured in the z-axis (height) and x-y-plane.
      • For the first one, I will parametrize the distance btw planes.
      • For the second one, the aspect ratio of the profiles.

Changes¶

  • Proximal phalange (PIP):
    • The goal is to make this part strongly versitely and substainable. This is a difficult part so this is also a challange.
    • I defined the PIP using non-equidistant planes where I defined crossectional sketches.
      • The distance btw planes is parametrized as well as the cross-section sketches.
      • The entire phalange is generated using a loft.
      • I find this to be the most optimal way achieve substainability.
    • Empty part with hollowing to allow the tendons to pass.
    • Design with 3D-printing orientation in mind. This mean that some features have been selected to allow or improve printing, and others, have been developed not for a functional purpose but a manufacturability purppose.

Images:¶

(Left) PIP desing. (Middle) Hollowed feature. (Right) Initial parametrization.
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